You put your phone number on CL? That's a bold move!
That's the only way I get contact from prospective buyers. There is a checkbox that prevents them from sending you email and I check that.
Been doing the phone number approach for over 9 years now and haven't had a problem. Most of the time they get an answering machine...my home number. I don't want to get calls to my cell phone. Then I make an appt to meet them at my storage unit which is only a mile from my home. I think in all these years I've only had maybe 5 no shows.
Also, when I get a message left on my machine and it has an out of town area code, I always ask them what city they're in to rule them out if it's 90 miles away...though I had one guy drive 400 miles for an item (one way). Knowing they come from a city that is say 30 miles away helps to keep the price firm...are they going to drive that far (one way) and then dicker over $5 or $10 off on a $50 item? Hasn't happened yet.